Ockams_Razor

Big Climb Reach the highest point

Big Goodbye Finish the game

Big Wall Go beyond the wall

Big Tunnel Enter a big tunnel

Big Ride Ride the train

Big Pack Wear a backpack

Big Help Wear something on your hip

Big Sit Ride the chairlift

Big View Visit the map

Big Walk Cross the drawbridge

Locksmith In Rave in the Redwoods, recover the piece of Soul Key.

Stick 'em In Rave in the Redwoods, earn 100 kills with an upgraded crossbow.

Pump It Up In Rave in the Redwoods, Pack-a-Punch a weapon.

Sticker Collector In Spaceland, find all of the quest items and complete the sticker pack.

Batteries Not Included In Spaceland, create an Exquisite Core.

Not a Gold Digger In Origins, share a weapon you dug up.

Party Animal Win 10 multiplayer games while playing in Party Games playlists.

Hoff The Charts! In Spaceland, unlock David Hasselhoff.

Sooooul Key In Spaceland, recover the piece of the Soul Key.

I'm Your Huckleberry In Buried, access all areas with the help of your new friend in one game.

The Bigger They Are In Spaceland, defeat 5 Brutes in one game without dying.

Rock On! In Spaceland, craft a Weapon of Rock.

Making the Rounds In Mob of the Dead, complete the cycle 3 times.

Acid Drip In Mob of the Dead, convert a weapon using a kit.

Monkey See, Monkey Don't In Shangri-La, get something from the monkeys.

Big Bang Theory In Moon, gain sweet, sweet, revenge.

Cryogenic Slumber Party In Moon, complete Richtofen's grand scheme.

Time Travel Will Tell In Shangri-La, acquire the focusing stone.

Zomb Disposal In Shangri-La, dispose of a Napalm zombie without it harming any players.

Candygram In Buried, make a candy delivery.

Stand-in In Call of the Dead, send the crew to Paradise in solo or co-op.

Ensemble Cast In Call of the Dead, send the crew to Paradise in co-op.

The eagle has landers In Ascension, escape on all 3 lunar landers.

Hoarder Complete all 6 Calling Card Challenges in any Zombies Category

See Me, Stab Me, Heal Me Fire a Pack-a-Punched Ballistic Knife at a downed ally to revive them from a distance.

Sally Likes Blood Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.

Insert Coin Access the terminal and battle the forces of the Cosmic Silverback in Dead Ops Arcade.

Just ask me nicely Break free from the torture chair.

When the Revolution Comes In Buried, return to processing.

Mined Games In Buried, be their pawn.

Revisionist Historian In Buried, rewrite history.

Ectoplasmic Residue In Buried, acquire a perk for free.

High Maintenance In Die Rise, be the architect of their instruction.

Vertigoner In Die Rise, fling 10 zombies in one game.

Tower of Babble In TranZit, obey the voices.

Fuel Efficient In TranZit, use an alternative mode of transportation.

Little Lost Girl In Origins, release Samantha.

Playing with Power In Origins, build all elemental staffs in one game.

All Your Base In Origins, activate all generators without allowing one to stop.

I Don't Think They Exist In TranZit, kill one of the denizens of the forest while it is latched onto you.